Question

unit 3 chem l test 2526
convert 2.5 moles of tin (sn) into atoms of tin.
1.2×10²² atoms
1.5×10²⁴ atoms
2.4×10²³ atoms
6.0×10²³ atoms

Explanation:

Step1: Recall Avogadro's number

Avogadro's number ($N_A$) is $6.022\times 10^{23}$ atoms/mol.

Step2: Use the conversion formula

The number of atoms ($N$) is given by $N = n\times N_A$, where $n$ is the number of moles. Here, $n = 2.5$ mol. So $N=2.5\ mol\times6.022\times 10^{23}\ atoms/mol$.

Step3: Calculate the result

$N = 2.5\times6.022\times 10^{23}=15.055\times 10^{23}=1.5055\times 10^{24}\approx1.5\times 10^{24}$ atoms.

Answer:

1.5×10²⁴ atoms